Grass Displace

[Ian P]

Hi All Just wodering what setting most people use for Displaced Grass materials, I had a set up that looked great but have left it to render in the scene over night at 1753x1240 and its only 1/4 way through pass 2 of 4 after a full night, Settings below

And my machine is a 3.0ghz dual core, 1 gb ram FX1400 Graphic Card:confused:

Any Ideas??

[JamesTaylor]

have you applied a vray displacement mod to your geometry? what are the settings for it, i have found that 3d displacement is very slow and heavy on the cpu - 2d displacement works much better from my experience, but its view dependant so the settings need adjusting from low res testing to finished hi res version (still to sort that bit out!)

[Ian P]

Ah, No I just applied displacement map to my texture, Is that slower or a major faux pas?

[JamesTaylor]

Not 100% sure how the displacement map on the material works to be honest, i think it may still need a VrayDispMod applying to the geometry???

 

i've gained the best results by applying a VrayDispMod to the geometry and placing the displacement texture in the slot availble in the modifer panel.

 

if your modelling in AutoCAD i have found that its best to draw a closed poly line for the areas of grass, then link into max and subdivide to 2m (gives you a polygon surface with no thickness), MeshSmooth on 0 itterations, UVWmap as planar 100x100 (size will depend on your disp texture etc) then VrayDisplacementMod on 2d mapping.

 

give it a try, see what you think, there may be better ways still that someone will share but thats my method at the min

[brianzajac]

Well you could always test how long it takes without the grass texture and see what effect your displacement has. But before that, as James said use the VRayDispMod (2D version). Play around with the resolution and precision and test them using the Region rendering option so that you only have to render a small portion of your scene (a few buckets) and only have to wait a few seconds to see the effect (of course assuming you set your render settings low enough).